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Thanks everyone, although I'm still a bit confused. As a child,I caught measles (MMR vaccine wasn't thought of) I had vac. for Rubella but family seems to be immune to Mumps - I've been through at least 5 Mumps epidemics - my mum went through more and my kids through fewer- but none of us have ever contracted Mumps (my sister and I were, as small children, found cuddling suffering friends; the GP said he'd see us next week - but he never did!
All in all, I think that I will tell the nurse 'No thanks', she does have cats so possibly salve everyone's conscience by having the rabies jab.
Buenchico - that's the site I was on, thanks.
Thank you everyone. :)